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update-utmp: fix assertion failure if rescue.target, multi-user.target and graphical.target are all inactive
If rescue.target, multi-user.target and graphical.target are all inactive, get_current_runlevel() is not able to determine current runlevel, and returns with zero. This zero runlevel value results to assertion failure in utmp_put_runlevel(). # systemctl stop rescue.target multi-user.target graphical.target # systemctl start systemd-update-utmp-runlevel.service systemd[1]: Stopped target Graphical Interface. systemd[1]: Stopped target Multi-User System. systemd[1]: Starting Update UTMP about System Runlevel Changes... systemd-update-utmp[67]: Assertion 'runlevel > 0' failed at src/shared/utmp-wtmp.c:275, function utmp_put_runlevel(). Aborting. systemd[1]: systemd-update-utmp-runlevel.service: Main process exited, code=dumped, status=6/ABRT systemd[1]: systemd-update-utmp-runlevel.service: Failed with result 'core-dump'. systemd[1]: Failed to start Update UTMP about System Runlevel Changes. Let's just print a warning in this case and skip the utmp update, to avoid systemd-update-utmp-runlevel.service failures.
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@ -191,6 +191,9 @@ static int on_runlevel(Context *c) {
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if (runlevel < 0)
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return runlevel;
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if (runlevel == 0)
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return log_warning("Failed to get new runlevel, utmp update skipped.");
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if (previous == runlevel)
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return 0;
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